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G. M. PRATT. 1 Mechanism for Operating the Feed and Shuttles ofSewing-Machines.

vNo. 226,550. Patented April 13,1880.v

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N.PETERS. FNOTO-LITNOGRAPNEK WASHINGTON, D C.

UNITED STATES ATENT OFFICE.

GEORGE M. PRATT, OF MIDDLETOWN, CONNECTICUT, ASSIGNOR TO THE VICTORSEWING MACHINE COMPANY, OF SAME PLACE.

MECHANISM FOR OPERATING THE FEED AND SHUTTLES F SEWING- MACHINES.

SPECIFICATION forming part Of Letters Patent No. 226,550, dated April13, 1880.

Application filed December .14, 1879.

To all whom it may concern:

Be it known that I, GEORGE M. PRATT, of Middletown, in the county ofMiddlesex and State of Connecticut, have invented certain new and usefulImprovements in Mechanism for Operating the Feed and Shuttles of Sewing-Machines; and I do hereby declare that the following is a full, clear,and exact description of the invent-ion, which will enable othersskilled in the art to which it appertains to make and use the same,reference being had to the accompanying drawings, and to the letters ofreference marked thereon, which form a part of this specification.

1 My invention relates to an improvement in that class ofsewing-machines having vibratory sh Little-levers and rotary feed-shaftsand it consists in an improved combination of devices by which apositive motion is transmit- 2o ted to said shuttle-lever and feed-shaftfrom a main rotary driving-shaft.

In the accompanying drawings, Figure 1 is a vertical cross-section of ahollow sewingmachine standard and bed-plate, showing my improvement.Fig.2 is a longitudinal section of a portion of the goose-neck,standard, and bed-plate, showing a side view of the transmittingdevices. Fig. 3 is a bottom view of a portion of the machine, showingthe connec- 0 tions of the operating-levers with the shuttlelever andfree shaft.

The letter A designates the main drivingshaft, which is provided, asusual, at its rear projecting end, with a belt-pulley and fly- 3 5wheel, and inside the standard carries an cecentric, B, which is coupledwith a connecting-rod, C, the lower curved end of which is connected tothe wrist-pin D of a crank, D, which is pivoted eccentrically to awheel, E,

keyed to the rear end of the rotary feed-shaft F. This means ofconnecting the rod C with the wheel E is a common expedient to avoid thestopping of said wheel on the dead-point.

Through the middle portion of the connecting-rod C is an elongated slot,G, through which projects a guide-pin, H, which is fixed in the innerwall of the standard I. This guide-pin and slot maintain thelongitudinallyreciprocating and oscillatory movement of theconnecting-rod always in the same paths, and

by this simple contrivance I obviate the necessity of the oscillatingbearings heretofore necessary for rods connecting with devices foravoiding the dead-center.

Upon a stud, J, projecting from the wall of the standard is fulcrumed anoscillating lever, K, the upper end of which is connected by a pivotedlink, Z, with the connectin g-rod C above the slot G, and the lower endof this oscillating lever terminates in a ball, m, which is embraced bythe forked bearing a of the shuttlelever N. I preferably provide thisbearing with shoes in a well known manner, which embrace the oppositesides of the ball and slide vertically on the jaws of the fork. Therotation of the main shaft causes a direct transmission of rotary motionto the feedshaft, and through the oscillating lever K and intermediatepivoted link, l, a vibratory movement is communicated to theshuttle-lever I.

It will be seen that the devices involved in the transmission of motionare few in number and of the simplest form, and their peculiarcombination materially reduces the cost of construction ofsewing-machines of the class for which they are intended.

Having thus fully described my invention, what I claim is Thecombination, with the bed-plate and bracket-arm of a sewing machine andthe shafts A and F, mounted respectively in said bracket-arm and beneaththe bed-plate, of the eccentric B, disk E, having the pivoted crank Dthereon, the connecting-rod C, having the slot G, the fixed fulcrum H,the shuttle-lever N, the lever K, for actuating said shuttle-lever,pivoted in the bracket-arm, and the link l, for connecting the upper endof the lever K to the connecting-rod C, whereby the rotation of theshaft A imparts a rotary motion to the shaft F and the proper vibratorymotion to the shuttle-lever N, as set forth.

In testimony that I claim the foregoing as my own I have hereto affixedmy signature in presence of two witnesses.

GEO. M. PRATT.

Witnesses:

ALBERT H. NoRRIs, J. A. RUTHERFORD.

